iPad Pro 12.9" Mic Stand Holder

No

0.2mm

All brackets that need to resist some force as the studs, knobs and gears were printed at 90% infill. The others, like the actual tablet holders (in and out slides & center ring) were printed at 25% infill.
I used supports on all parts, because it was either needed or gave better results.

For the iPad Pro 12.9" you need to print:

1x Center-ring

1x Center Stud

1x Mic Stand Bracket

1x Knob

1x Knob Insert

2x Inner Side Bracket

2x Outer Side Slide

2x Inner Top Bracket

1x (or 2x) Outer Top Slide

1x (or 0x) Outer Bottom Pen Slide

4x Gear M5

4x Slider Knob

*) When you don't need the Apple Pencil holder you just use two Outer Top Slides.

Post-Printing

Assembling

You'll need the following parts to complete assembly:

For attaching the 4 Inner Brackets to center ring:

12x Allen screw M3x12mm

12x Nut M3

For attaching the MIC Stand Bracket to the Center Stud:

1x M8x30mm hex bolt

1x M8 nut

For attaching Center Stud to Center Ring:

1x M8x30mm hex bolt

1x M8 lock-nut (allows for adjuistable tightening of the center ring without the risk of getting lose and adjust the force for turning the tablet from landscape to portrait)

For attaching the gears:

4x M5x25mm (or 20mm) hex bolt

4x M5 nut

For attaching assembly to a mic stand:

In the end you'll need 3/8 thread to screw everything onto a mic stand. I sacrifised the cheapest mic clamp I could get. (Stagg MH-8AH) This had a 5/8 thread bushing inside which I used to press fit into the Mic Stand Bracket. This allowed the use of a standard 5/8-3/8 thread adapter.